DTC B2965 Key In Ignition Fault. Chevrolet PJJ 2000

For 1990-2009 cars
Body Control Module Components
Passlock Sensor™, Fog Lamp, Instrument Panel Dimmer, ETS Off and Ignition Switches

### Circuit Description

CKT 80 is an input to the body control module (BCM). The BCM monitors CKT 80 in order to determine if the ignition key is in the ignition switch.

### Conditions for Running the DTC

The accessory input is active for 30 seconds.

### Conditions for Setting the DTC

The KEY-IN IGNITION input to the BCM is not active.

### Action Taken When the DTC Sets

• | The BCM assumes the KEY-IN IGNITION input to be active.

• | The BCM stores DTC B2965 in memory.

• | The KEY-IN IGNITION chime is inoperative

### Conditions for Clearing the DTC

• | A current DTC B2965 will clear when the code setting condition is no longer present.

• | All BCM history codes clear after 100 ignition cycles (from OFF to ON) with no current codes active during the 100 ignition cycles.

### Diagnostic Aids

• | Inspect the wiring and connections to the ignition switch and BCM.

• | If the DTC is a history DTC, the problem may be intermittent. Perform the above tests while wiggling the wiring and connectors. This may often cause the malfunction to appear.

### Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

1. The scan tool will display YES when the ignition key is inserted into the ignition switch.

2. The scan tool will display NO when the ignition key is removed from the ignition switch.

3. This step tests for a short to ground in circuit 80.

Step | Action | Yes | No
--- | --- | --- | ---
1 | Did you perform the Body Control Module Diagnostic System Check? | Go to Step 2 | Go to A Diagnostic System Check-Body Control System

2

1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
3. With a scan tool, observe the KEY-IN IGNITION parameter in the body control module data list.

Does the scan tool display YES?

Go to Step 3

Go to Step 4

3 | While observing the KEY-IN IGNITION parameter on the scan tool, remove and reinsert the ignition key. Does the KEY-IN IGNITION parameter change state? | Go to Testing for Intermittent and Poor Connections in Wiring Systems | Go to Step 6

4

1. Disconnect the BCM connector C3.
2. Turn ON the ignition, leaving the engine OFF.
3. Test for a good ground at terminal B12 of connector C3. Refer to Circuit Testing in Wiring Systems.

Is ground present at the terminal?

Go to Step 8

Go to Step 5

5

Refer to Circuit Testing and Wiring Repairs in Wiring Systems in order to test the following circuits for an open:

• | The ground circuit 150

• | The signal circuit 80

Was a condition found and corrected?

Go to Step 12

Go to Step 9

6

1. Turn OFF the ignition.
2. Disconnect the ignition switch connector C1.
3. Turn ON the ignition, with the engine OFF.
4. With a scan tool, observe the KEY-IN IGNITION parameter.

Does the scan tool display YES?

Go to Step 7

Go to Step 9

7 | Test the signal circuit of the ignition switch for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 8
8 | Inspect for poor connections at the harness connector of the body control module. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 10
9 | Inspect for poor connections at the harness connector of the ignition switch. Refer to Testing for Intermittent and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 11
10 | Replace the body control module. Refer to Body Control Module Replacement. Important: Perform the set up procedure for the body control module. Refer to BCM Programming/RPO Configuration. Did you complete the replacement? | Go to Step 12 | --
11 | Replace the ignition switch. Refer to Ignition Lock Cylinder Replacement in Steering Wheel and Column. Did you complete the replacement? | Go to Step 12 | --

12

1. Use the scan tool in order to clear the DTCs.
2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

Go to Step 2

System OK